babjo

// global
var myApp = myApp || {};

// namespaces
myApp.routers = myApp.routers || {};
myApp.model = myApp.model || {};
myApp.model.special = myApp.model.special || {};

babjo

var testModule = (function () {
    var myPrivateVar, myPrivateMethod;
    // A private variable
    myPrivateVar = 0;
    // A private function
    myPrivateMethod = function(foo) {
        console.log(foo);
    };
    return {
        // A public variable

babjo

class FakeBlogRepository implements BlogRepository {

    private Map<String, List<Post>> data = new HashMap<>();
    private long lastPostId = 0L;

    public long save(long userId, Post post) {
        lastPostId++;

        post.setId(lastPostId);
        List<Post> posts = data.get(userId);

babjo

class AuthClientImpl implements AuthClient {
    public long verifyToken(String token) {
        String rawJson = decrpyt(token);
        User user = deserialize(rawJson);
        return user.getId();
    }

    private String decrpyt(String token) { ... }
    private User deserialize(String rawJson) { ... }
}

babjo

public class BlogService {

    public BlogService(AuthClient authClient, BlogRepository repository) {
        this.authClient = authClient;
        this.repository = repository;
    }

    public AddPostResponse addPost(AddPostRequest request) {
        // verifyToken 메소드 파라미터 추가
        // 리턴 값이 User 객체로 변경

babjo

public class BlogServiceTest {

    @Mock
    private AuthClient authClient; // mock 객체생성

    @Mock
    private BlogRepository blogRepository; // mock 객체생성

    @Test
    public void addPost() {

babjo

public class BlogServiceTest {

    @Test
    public void addPost() {
        // given
        AuthClient authClient = ...
        BlogRepository blogRepository = ...

        BlogService service = new BlogService(authClient, blogRepository); // 생성자로 협력 객체 주입
        AddPostRequest request = ...

babjo

public class SmallClass1 {
	private Collaborator collaborator1;		
	public void doSomething(){
		...
	}
}
public class SmallClass2 {
	private Collaborator collaborator2;		
	public void doSomething(){
		...

babjo

public class BigClass {
	private Collaborator collaborator1;
	private Collaborator collaborator2;
	private Collaborator collaborator3;
	private Collaborator collaborator4;
	private Collaborator collaborator5;
	....
		
	public void doSomething(){
		...

babjo

public class ClassA {
  ...
  public void methodA() { // changed
     ...
  }
}
public class ClassB {
  ...
  public void methodB() { // Oh, not affected!
     ...